Bump faker from 2.13.0 to 2.15.1

Bumps [faker](https://github.com/faker-ruby/faker) from 2.13.0 to 2.15.1.
- [Release notes](https://github.com/faker-ruby/faker/releases)
- [Changelog](https://github.com/faker-ruby/faker/blob/master/CHANGELOG.md)
- [Commits](faker-ruby/faker@v2.13.0...v2.15.1)

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile

@@ -118,7 +118,7 @@ end
 group :test do
   gem 'capybara', '~> 3.33'
   gem 'climate_control', '~> 0.2'
-  gem 'faker', '~> 2.14'
+  gem 'faker', '~> 2.15'
   gem 'microformats', '~> 4.2'
   gem 'rails-controller-testing', '~> 1.0'
   gem 'rspec-sidekiq', '~> 3.1'

Gemfile.lock

@@ -209,7 +209,7 @@ GEM
       tzinfo
     excon (0.76.0)
     fabrication (2.21.1)
-    faker (2.14.0)
+    faker (2.15.1)
       i18n (>= 1.6, < 2)
     faraday (1.0.1)
       multipart-post (>= 1.2, < 3)
@@ -709,7 +709,7 @@ DEPENDENCIES
   dotenv-rails (~> 2.7)
   ed25519 (~> 1.2)
   fabrication (~> 2.21)
-  faker (~> 2.14)
+  faker (~> 2.15)
   faraday
   fast_blank (~> 1.0)
   fastimage